Wheel drive shaft
The drive shafts are blocks of movable shafts that transmit torque from the differential cup assembly to the rear wheel assemblies.
Each axle block contains a universal inner and outer constant velocity joint connected to the drive shaft of the wheels. The inner and outer joints are fully movable, but cannot move inward or outward.
Cardan shaft
The driveshaft assembly is a 2-piece design. The front shaft consists of a constant velocity joint type "A" at the front and a universal joint and fork at the rear.
The rear shaft consists of a central bearing and a central fork, which are pressed into the rear half of the cardan shaft and secured with a retaining ring. The front and rear shafts are connected in the fork using a universal joint. The rear shaft is attached to the axle using a flange, which is attached to the rear shaft by a universal joint.
The center bearing provides support where the front and rear shafts mate and is bolted to the underbody. The front constant velocity joint is bolted to the power take-off unit (PTU), and the rear universal joint flange is bolted to the clutch assembly.
Rear drive unit
The rear drive module (RDM) in this vehicle consists of the clutch controller and an aluminum housing that contains the clutch assembly and differential.
The on-demand differential distributes variable torque/power to the rear wheels via individual half-shafts.
The on-demand system works as follows: Only when the front wheels slip does it distribute torque/power proportionally to the rear wheels. As long as there is no difference in the speed of the front wheels compared to the rear wheels, no torque/power is transmitted to the rear wheels.
When the front wheels slip relative to the rear wheels, the clutch controller receives information from the ECM, BCM, EBCM, and the clutch controller sends a signal to the clutch assembly to operate the clutch pack, which then distributes torque/power to the rear wheels. The rear axle torque is adjusted in the range of 0-2,530 N·m depending on various road conditions such as asphalt, sand, snow and ice. The front/rear torque distribution ratio is continuously adjusted to achieve the optimum value in the range of 100/0 ~ 50/50 in real time, depending on the vehicle driving mode and road conditions.
The system is equipped with a built-in protection device that reduces rear wheel torque when excess heat is generated, thereby protecting the rear wheel drive unit (RDM).
Rear differential fluid assembly
The rear differential assembly uses a specially formulated synthetic hypoid fluid designed to provide service throughout its service life. However, it is necessary to maintain the proper fluid level to ensure proper operation of the rear differential assembly.